<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>过度延迟时间</title>
    <style>
        .box{
            margin: 0 auto;
            margin-top: 100px;
        }
        .box .btn{
            display: block;
            margin: 0 auto;
            width: 100px;
            height: 50px;
            background-color: rgb(23, 101, 101);
            line-height: 50px;
            font-size: 15px;
            color: white;
            border: none;
            border-radius: 30px;
            transition: 2s;
            transition-delay: 300ms;  /*过度延迟时间*/
        }
        .box .btn:hover{
            width: 200px;
            height: 100px;
            line-height: 100px;
            font-size: 30px;
            background-color: blue;
        }
    </style>
</head>
<body>
    <div class="box">
        <button class="btn">按钮</button>
    </div>
</body>
</html>